2779947 has 16 divisors (see below), whose sum is σ = 4336000. Its totient is φ = 1755432.

The previous prime is 2779943. The next prime is 2779949. The reversal of 2779947 is 7499772.

It is a happy number.

It is not a de Polignac number, because 2779947 - 2² = 2779943 is a prime.

It is a super-3 number, since 3×2779947³ = 64451169623480733369, which contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2779943) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2197 + ... + 3222.

It is an arithmetic number, because the mean of its divisors is an integer number (271000).

2^2779947 is an apocalyptic number.

2779947 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

2779947 is a deficient number, since it is larger than the sum of its proper divisors (1556053).

2779947 is a wasteful number, since it uses less digits than its factorization.

2779947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5447 (or 5441 counting only the distinct ones).

The product of its digits is 222264, while the sum is 45.

The square root of 2779947 is about 1667.3173063337. The cubic root of 2779947 is about 140.6086932203.

The spelling of 2779947 in words is "two million, seven hundred seventy-nine thousand, nine hundred forty-seven".